Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18bc911f5be566b…

MALICIOUS

PDF

88.1 KB Created: 2021-07-21 01:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b7c46cacdd05691188a0738ec16f43c SHA-1: ec30cb4c0880a33bcdc20e171c3a00c442c46ae7 SHA-256: b18bc911f5be566b7c64c8f11519697a2f9fbf287b7fe9e1d7ea7a5b8fa7b4dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which point to compromised websites hosting other PDFs. This behavior is indicative of a link farm designed to lead users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a89de1df---69945266528.pdf In PDF document text
    • https://soechi.net/userfiles/file/zavovemevafipetes.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d479e3c0b5---43994372718.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/mugasonukilipituka.pdfIn PDF document text
    • https://posh.hr/files/nekesopurafuwovafikikug.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7d555670bc1f400df79682739a906c97/wudezelotupuxosubevaja.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/zejosurokotazuwutiw.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/wovesanujatu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4a2b8c93---99256982050.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a850f7a77d8---65708421491.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/41163134053.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/13799956190.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b240073d2cdaeced3bef407eb20155b9/xotixurisufirig.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3b69a52f---nadovulupijaxufujadekolat.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/chol2ia5ur5adcup84cm8436dk/fudakejakir.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/nnms5mslfti0o1efbb15guqa32/kejizexedegazoridotakin.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51325f89---gurijukipevaf.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/660c4i94q2080shjl20k5n98p3/47776737201.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa508bf2490626f2a6847e8c062a28ac/fojanusisetomilevoluxaj.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160700a3be9fdb---xorobisekukela.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/juwatabedix.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/34854589021.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d40e50e588b511b7501dcff0aa766dad/55497203488.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/bemuf.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qgba11150lle748vc76gbdeoks/84699305758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=will+chemosis+go+awayPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 17080 bytes
SHA-256: 9e8042a58d7b959fc1d50272f7dac4fc2adf8bb1ac32daa8c02113457dfbd299
font_01_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 10568 bytes
SHA-256: 4da570d908609538e7235c480473a28cbe2cf2f93b4615197a76576cc8267da2